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I generally have had good luck using products from the intake side of the system under the hood with the system running. It may not apply to the 1Z product. Of course it would be best to take enough things apart to be able to spray product directly on the evaporator coil fins themselves, but that's generally not practical. When the system is off, the IHKA closes all vent flaps. If you follow the 1Z instructions literally this is probably why you can't get down the vents. The system may have to be on but with the fan on minimum so all of the product doesn't get sprayed back into your face.
You have to jump through a couple of hoops to do this from the intake side, including ensuring that you get both the evaporator and heater core sprayed, and that the system doesn't go into automatic recirc (no lights are illuminated to tell you when the system does this, it just does it) when doing the AC because of a large difference between setpoint and ambient/inside temperature.
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